Re: Is this cool with you?

Hi bobbym,

bobbym wrote:

Hi;

4 checkers are randomly placed on a chessboard, what is the probability that no checker is in the same row or column as any other?

A) says:

B) says:

What do you like?

This is a post on first page.(perm(8,4)^2)/perm(64,4) = 1680^2/15249024 is my answer.When we place a checker on the board, the number of rows and columns available for the next checker decreases by 1.So, available squares will become 7x7, 6x6 and 5x5. Hence the probability = (8*7*6*5)^2/(64*63*62*61).

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?